Re: [Xenomai-help] Xenomai on the TS-7553 ARM SBC

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 05/10/2012 07:38 PM, aubin.rebillat@domain.hid wrote:
>> De: "Gilles Chanteperdrix" <gilles.chanteperdrix@xenomai.org>
>> À: "aubin rebillat" <aubin.rebillat@domain.hid>
>> Cc: xenomai@xenomai.org
>> Envoyé: Jeudi 10 Mai 2012 19:28:46
>> Objet: Re: [Xenomai-help] Xenomai on the TS-7553 ARM SBC
>>
>> On 05/10/2012 03:26 PM, aubin.rebillat@domain.hid wrote:
>>> Hello,
>>>
>>> I am trying to port Xenomai on the TS-7553 SBC from Technologic
>>> systems, based on the ECONA CNS2132 (STAR8132) from Cavium
>>> networks (250 MHz arm922t).
>>> A Linux kernel is available for this board, version 2.6.24.4, which
>>> is running fine.
>>> I patched this kernel with adeos-ipipe-2.6.24-arm-1.9-01.patch and
>>> I implemented all the IPIPE code for the CNS2132 and everything is
>>> compiling and booting fine.
>>
>> Note that the following page:
>> http://www.openembedded.org/wiki/TS-7500
>>
>> Proposes patches for linux 2.6.35, which is really, really, really
>> more
>> current than 2.6.24, and for which an I-pipe patch also exists.
>>
>> I mean, with 2.6.24, you may find bugs we do not even remember,
>> because
>> they were fixed such a long time ago.
>>
> 
> I preferred to use the version 2.6.24  which is shipped with the board 
> because the manufacturer can provide support in case of trouble.

As soon as you patch with the I-pipe patch, the manufacturer can answer
to your support requests that you are not using its kernel.

> But, I compiled and tested the version 2.6.35 and it's running fine at 
> first but the dmesg output is corrupted with a lot of "BAD IRQ".
> I thought that this version was not really stable yet and I don't have
> enough time in my project to ensure it. That's why I preferred to use
> the version 2.6.24.
> 
> If a bug is happening with our application, I will definitely move
> to the most recent one.

Well, I had a look at the patches for 2.6.35, and they really mess with
things with which they should not (cache and TLB handling for instance).
If you intend to do some serious work with this platform, you should
really consider doing a clean linux port, or get some specialist to do
it. Otherwise this will byte you sooner or later.

-- 
					    Gilles.